Dell’s shiny green blade server

The PowerEdge M-series from Dell has it all, from a hyper-efficient power supply to superior cooling and power management

From a green-tech perspective, the most intriguing server I’ve ever known (from a distance) was the Gemini Green Series from Open Source Solutions (OSS). Highly efficient power supplies? Check. Efficient internal cooling? Check. Easily swappable components — from motherboards to memory to power supplies — to eliminate the need for ripping and replacing upgrades? Check.

Alas, OSS is no more, but its legacy won’t be forgotten — not by me, anyway. The fact that it’s gone the way of rainbow suspenders is no reason to dismiss the beauty of its product design either. In fact, I see glimmers of the Gemini in Dell’s newly announced PowerEdge M-Series chassis and blades. Dell designed the M-Series “from the ground up using Dell Energy Smart technologies, resulting in 30 industry patents,” clearly with sustainability in mind.

Playing it cool

Like the OSS Gemini (which was a 2U server, by the way), Dell’s new PowerEdge blades employs 90-plus percent efficient power supplies, developed in-house. (For reasons I still can’t fathom, the standard among server vendors still appears to be in the realm of 80 percent.)

Not only is Dell’s power supply capable of hitting a higher energy-efficiency level; it does so more quickly than rival power supplies, according to Mike Roberts, senior product planning manager for the M-Series line. He says that most power supplies achieve their maximum level of energy efficiency only when the supply is running at 90 to 100 percent utilization — which certainly isn’t the norm. “We get to a really good efficiency level at relatively low threshold, 88 percent at only 20 percent utilization,” he says.

Those seemingly small differences among power supplies can actually make a dramatic difference in terms of reducing a server’s power and heat waste — and the associated costs scale impressively the larger your datacenter.

Dell also claims to have developed an innovative internal cooling system, designed to adapt to the needs of both high-end and low-end configurations. In addition to its optimized fans (as well as their underlying algorithms), the system boasts a superior airflow design, according to Roberts; Dell has taken great pains to remove impedance throughout the chassis. “The easier the air flows, the less hard the fans have to work,” says Roberts.

The chassis also has three distinct cooling zones, each cooled by its own fan bank. In lower-end configurations where the chassis isn’t fully loaded with blades, “the fans on the side can run really slowly because they don’t have to work hard to cool their zone,” says Roberts.

There’s also the swappability factor (a word you will not find in Webster’s, by the way). In an ideal green-tech world (mine anyway), an IT admin would be able to swap in and out all major components in his or her servers, while they’re on the rack, such that machines wouldn’t need to head to the shop or, more likely, to the recycling bin if a substantial upgrade is needed. It doesn’t look like the major hardware vendors of the world are ready to offer that level of hardware interoperability, but here, Dell has taken a step in that direction.

Specifically, the company has developed what it dubs FlexIO switch technology for easily upgrading the machine’s network connectivity up to 10Gig without replacing the base switch. For the enclosure, customers can opt for an upgradeable Dell PowerConnect M6220 Layer 2/3 Ethernet blade switch, with 1Gb ports and optional bays that can support either 10GbE or stacking ports.

Further, customers have three Cisco Ethernet switch choices, including a switch with a variety of 1Gbps, 10 Gbps, and stackable ports. Also available: a Cisco Infiniband switch. Add to that the options for two Brocade 4Gbps Fibre Channels, as well as Fibre Channel and Ethernet Pass Through options.

Additionally, with an eye on the future, Dell has designed the M1000e enclosure not to be dependent on specific server processor/chip set architecture. Further, it will be able to accommodate double-wide blades down the road.

Secret software sauce

Dell’s hardware choices alone don’t result in a more energy-efficient machine. Like an increasing number of vendors, Dell is turning to server management software to rein in energy waste — a promising development that stands to lower those power bills and extend the life of hardware.

In Dell’s case, that software takes the form of its Version 5.3 of its OpenManage systems management suite, released last November. Dell touts the package — which comes at no cost with the blade package — as “easy-to-use yet powerful management tools that help reduce the cost and complexity of managing computing resources.”

Among its features is dynamic power management, which enables admins to set high- and low-power thresholds to help ensure blades operate within their defined power envelope. The norm is for servers to consume the maximum recommended amount all the time, even if they’re not usually being run at full bore. Moreover, the package offers real-time reporting for enclosure and blade power consumption, and the ability to prioritize blade slots for power to provide optimal control over power resources.

So, for example, if an admin were to allot 3,000 watts to a given chassis, the system would distribute power evenly among all the blades. However, if the chassis wasn’t pulling enough power, for whatever reason, it could be set to prioritize which blades would be throttled down first.

Your benchmark or mine?

As Dell tells it, the various greenovations it’s injected in these babies reap superior power efficiency (that is, performance per watt) over rival blade offerings from HP and IBM. According to a Dell-sponsored study by Principled Technologies, “the PowerEdge M-Series consumes up to 19 percent less power and achieves up to 25 percent better performance per watt than the HP BladeSystem c-Class. Compared to the IBM BladeCenter H, the M-Series consumes 12 percent less energy and achieves up to 28 percent better performance per watt.”

Were you to apply a cost-per-kilowatt amount to those figures, as Dell has, you’d save $2,600 annually per year over HP’s blade competitor and $1,500 per rack per year over IBM’s.

I wouldn’t discount Principled Technologies figures outright, just because the study was sponsored by Dell. It’s entirely conceivable that, given the power-efficient measures Dell has taken, its blades consistently delivered better per-watt performance — but only in that test, which used the SPECjbb2005 benchmark.

Problem is, that benchmark wasn’t really developed to measure power efficiency. Organizations and analysts are still grappling as to what method is best for accomplishing that, as evidenced by a recent study comparing the power efficiency of AMD and Intel’s respective quad-core chips.

The point is, benchmarks are slowly emerging, such as SPEC’s recently announced SPECpower_ssj2008. However, that benchmark isn’t suited for a blade environment. In short, work here remains to be done.

Hopefully the InfoWorld Test Center will have a chance to test Dell’s claims against offerings from HP and IBM. Whatever the outcome of that test might be (again, if it happens), I still extend kudos to Dell for further raising the green bar more among hardware vendors.

One last thought: IBM and HP may claim that they’re not worried about Dell’s latest foray into the world of blades. In fact, a rep from one of those vendors sent me a rather dismissive note prior to the official Dell announcement: “We’ve been hearing rumors over here that Dell finally plans to announce their copycat blade on Monday. Odd that they’d choose a national holiday to announce, but that’s another story ;-).”

Of course, when you go out of your way to eagerly point something out and declare you’re not worried about it — you’re probably at least a leetle bit worried about it. Conceivably, Dell has surprised the competition with the level of innovation it’s brought to the table here, enough to generate some concern.